Jambs smith



(N Model.)

J. SMITH.

INGANDESGBNT. ELECTRIC LAMP.

No. 365,351. Patented June 21, 1887.

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' n. Pneus. mom. wuungm nu UNITED STATES PATENT OFFICE.

JAMES SMITH, oE NEW ALBANY, INDIANA, AssIeNoE or ONE-HALE VTo J. E.GEBHAET, OE sAME PLAGE INCANDESCENT eLecTmc LAMP.

SPECIFICATION forming part of Letters Patent No. 365,351, atea June21,1887.

Application filed February 17, 1887. Serial No. 227,931.

, of the United States, residing at New Albany,

in the county of Floyd and State of Indiana,`

have invented certain new and useful Improvements in IncandescentElectric Lamps; and I do declare the following to be a full, clear, andexact description of. the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had tothe accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

This invention relates to certain improvements in incandescent electriclamps,vand it has for its objects to provide a convenient means forthrowing a particular lamp out of circuit or in again, so as to renderthe carbon non-candescent or incandescent, and thus pro duce the lightor extinguish it, as more fully hereinafter specified. These objects Iattain by the means illustrated in the `accompanying drawings, in which-Figure l representsa side elevation of my improved lamp and itsconnections, showing the carbon filament in circuit. Fig. 2 repre#`sents a similar view showing the parts so disposed as to throw thecarbon vfilament out of circuit; and Fig. 3 represents an elevation ofthe device, with a portion of Vthe front broken away, showing thecontact-points of the circuit and those of the carbon filamentseparated, in the position which the parts assumewhen the light is notin operation.

Referring to the drawings, the letter A indicates a tubular'casing,having a head, B,-

secured thereto, the head being providedwith an internallyscrew-threaded boss, C, by which the device may be attached to anysuitable pendant, The head of the upper tubular casing has secured to itan internallyextending stud, E, of rubber or other non-conductingmaterial, to which are attached the segmental spring-bearings F, whichare insulated at their point of attachment and have electricalconnection with the linewires of the circuit. The upper tubular sectionis provided with slots A on diametri cally-opposi te sides, which extendfirst vertically from the low er edge and then extend segmentally partlyaround the section, the segmentally-extending slots having their loweredges formed on a curve, so as to lift the lower section when turned inone (No model.)

direction and drop it when turned in the opposite direction. The lowertubular section, A, of the device is provided with pins G, which areadapted to engage the slots in the upper section before mentioned. TheSaid lower section is provided with the polesH I, which connect with thecarbon filament in the bulb or globe of the lamp, which is indicated bythe letter K.

nThe device is designed to be secured to a chandelier or other pendantin electrical connection with a suitable generator, and is so arrangedin relation thereto that the springbearings F' will always be in linewith the electric circuit.

By turning thelower section of the device so that its pins will ride upon the curved lower portion of the slotted upper section, the

`contact-points of the lower section will be brought to bear against thespring-bearings of the upper section, establishing a current through thelamp and rendering the carbon filament incandescent, thus producing thelight. When the-lower section is turned so that the pins of the uppersection fall into the lowest depressions of the slots, the contactbetween the poles of the lamp proper and the spring-bearing of theuppersection will be broken, the current cut oft', and the lightextinguished. To restore the light it is evldent that the lower sectionhas only to be turned in the opposite direction.

Having thus describedmy invention, what I claim, and desire to secure byLetters Patent, is

The combination, in an electric lamp, of an upper tubular section havinginsulated springcontact' bearings in the main-line circuit, anddiametrically-opposed slots, constructed with lower cam-edges, and thelower lamp-section adapted to tit within the upper tubular section, thesaid lower section carrying the bulb and carbon filament, and thecontact-poles adapted to be thrown into and out of contact with thecontact-bearings, so as to establish or extinguish the light of the lampat will, substantially as specified. i

In testimony whereof I aftix my signature in presence ofy two witnesses.

- JAMES sMITH.

